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Load-bearing capacity of various CAD/CAM monolithic molar crowns under recommended occlusal thickness and reduced occlusal thickness conditions

Title
Load-bearing capacity of various CAD/CAM monolithic molar crowns under recommended occlusal thickness and reduced occlusal thickness conditions
Authors
Choi S.Yoon H.-I.Park E.-J.
Ewha Authors
박은진
SCOPUS Author ID
박은진scopus
Issue Date
2017
Journal Title
Journal of Advanced Prosthodontics
ISSN
2005-7806JCR Link
Citation
vol. 9, no. 6, pp. 423 - 431
Keywords
Fracture resistanceMonolithic ceramicOcclusal thicknessPolymer-infiltrated ceramicZirconia-reinforced lithium silicate
Publisher
Korean Academy of Prosthodontic
Indexed
SCIE; SCOPUS; KCI scopus
Abstract
PURPOSE. The goal of this study was to evaluate the fracture resistances of various monolithic crowns fabricated by computer-aided design and computer-aided manufacturing (CAD/CAM) with different thickness. MATERIALS AND METHODS. Test dies were fabricated as mandibular molar forms with occlusal reductions using CAD/CAM. With different occlusal thickness (1.0 or 1.5 mm), a polymer-infiltrated ceramic network (Enamic, EN), and zirconia-reinforced lithium silicate (Suprinity, SU and Celtra-Duo, CD) were used to fabricate molar crowns. Lithium disilicate (e.max CAD, EM) crowns (occlusal: 1.5 mm) were fabricated as control. Seventy crowns (n=10 per group) were bonded to abutments and stored in water for 24 hours. A universal testing machine was used to apply load to crown until fracture. The fractured specimens were examined with a scanning electron microscopy. RESULTS. The type of ceramics and the occlusal thickness showed a significant interaction. With a recommended thickness (1.5 mm), the SU revealed the mean load similar to the EM, higher compared with those of the EN and CD. The fracture loads in a reduced thickness (1.0 mm) were similar among the SU, CD, and EN. The mean fracture load of the SU and CD enhanced significantly when the occlusal thickness increased, whereas that of the EN did not. CONCLUSION. The fracture loads of monolithic crowns were differently influenced by the changes in occlusal thickness, depending on the type of ceramics. Within the limitations of this study, all the tested crowns withstood the physiological masticatory loads both at the recommended and reduced occlusal thickness. © 2017 The Korean Academy of Prosthodontics.
DOI
10.4047/jap.2017.9.6.423
Appears in Collections:
의과대학 > 의학과 > Journal papers
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